“Smart” can also mean less code, more modularity, efficient algorithms. Obfuscated code is also “smart”, but in a different way.

My smart code plans for me to be sort of stupid and slow in the future, lacking the context I had when I was writing it. And I'm delighted when some seemingly hard problem has a simple, straightforward solution.

I often wonder what happened to me. There's a preponderance of evidence that I was smart in the past but very little that I'm smart today.